linux-kernel - Re: [Y2038] [PATCH 3/8] powerpc: fix vdso32 for ppc64le

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Message-ID: <CAK8P3a3BPhX_NRFj66WyRLQUOCV-FGRjmPCgB7gqxMoK8hfywg@mail.gmail.com>
Date:   Wed, 20 Nov 2019 20:35:07 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Ben Hutchings <ben.hutchings@...ethink.co.uk>
Cc:     y2038 Mailman List <y2038@...ts.linaro.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Y2038] [PATCH 3/8] powerpc: fix vdso32 for ppc64le

On Wed, Nov 20, 2019 at 8:13 PM Ben Hutchings
<ben.hutchings@...ethink.co.uk> wrote:
>
> On Fri, 2019-11-08 at 21:34 +0100, Arnd Bergmann wrote:
> > On little-endian 32-bit application running on 64-bit kernels,
> > the current vdso would read the wrong half of the xtime seconds
> > field. Change it to return the lower half like it does on
> > big-endian.
>
> ppc64le doesn't have 32-bit compat so this is only theoretical.

That is probably true. I only looked at the kernel, which today still
supports compat mode for ppc64le, but I saw the patches to disable
it, and I don't think anyone has even attempted building user space
for it.

       Arnd